Abstract
The growth rate of ammonium pentaborate octahydrate has been measured as a function of supersaturation for various particle sizes, at different temperature range of 20–50°C in a laboratory-scale fluidized bed crystallizer. The values of mass transfer coefficient K, reaction rate constant, k r , and reaction order, r, were determined from the general mass transfer equation without assumption using an improved computer program which gives a high accuracy. The relative standard deviation between the overall growth rate data obtained from the general mass transfer equation by using kinetic parameters ( k r , K and r) found in an improved program and those experimentally obtained do not exceed 0.8%. It was found that increasing the temperature and particle size cause an increase in the values of the kinetic parameters ( K g , k r , K). Overall growth rate of ammonium pentaborate octahydrate is controlled by both diffusion and reaction steps at temperatures lower than 40°C, whereas it is completely controlled by diffusion at temperatures higher than 40°C.
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